Technical description and composition of the PANASONIC TX-R32LX80S TV, panel type and modules used. The composition of the modules.PANASONIC
Model: TX-R32LX80S TX-32LX80
Chassis / Version: LH80
Panel: LTA320AA03 M01 LTA320AA03M01
T-CON: 320AA03C2LV0.0
Inverter (backlight): INV32S12M REV 0.5 INV32S12J
Power Supply (PSU): TNP4G433 AL
PWM Power: FA5501AN, TUC4GJ5007
MOSFET Power: B1DFBR000008
MainBoard: TNP4G431 BP & TNP4G446 (Audio)
IC MainBoard: EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448
Tuner: ENG39E04GF
Control: IR: TNP4G448, Remote: EUR7651140
TX-32LX80 Specifications
PANASONIC TX-R32LX80S
General recommendations for TV LCD repair
Possible manifestations of defects
- The PANASONIC TX-R32LX80S does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Most likely, in this case, the main switching power supply (SMPS) TNP4G433 is faulty. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short-circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers FA5501AN, TUC4GJ5007, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no picture, but there is sound and reaction to the remote control. Or, for a second, the image may appear immediately after switching on.
These manifestations can be provoked by the power module, or by defects in the inverter, as well as by the skew of currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter for the power supply of the inverter are in good working order, you should make sure that the lamps are in good condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes it is necessary to disable the inverter protection for diagnostic purposes. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the TNP4G431 motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and the matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board needs to be replaced in the event of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448 and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Usually such defects are detected by local heating of the chip.If you suspect a malfunction of the ENG39E04GF tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
PANASONIC TX-32LX80 has no image when there is a signal, and it is often caused by a malfunction of the display backlight. Moreover, the problem can be both inside the LCD panel (matrix) LTA320AA03M01, for example, a malfunction of CCFL (EEFL) lamps, and outside in their power source - an inverter.
Without backlighting, sometimes you can see a barely noticeable image with a certain successful hit of external light on the screen.
Often, repairing the backlight requires disassembling the LTA320AA03M01 LCD panel - a painstaking process that requires special attention and accuracy from the master. In such cases, there is a possibility, with the slightest negligence, to damage the glass or loops and the TV may become unrepairable.
We strongly do not recommend doing such work to owners of TVs and craftsmen who do not have experience in repairing LCD panels! Moreover, at home (at the owner's home).
If there is no image in the presence of backlight, the screen becomes slightly lighter when turned on, and if the TV is open, the light from the lamps can be seen through the holes in the panel case.
In this case, there may be a malfunction inside the panel, damage to strips, loops, the T-CON board (Timing Controller) may be defective. But often the main board MainBoard TNP4G431 turns out to be faulty; a software failure is also possible.
In such cases, the master first of all needs to check the main supply voltage of the panel at the LVDS connector, the fuses on the T-CON board or the panel brackets, as well as the supply and reference voltages for line and column drivers - VGH, VGL, Vcom.
If all of the above measurements are within the normal range, then the oscilloscope must track the passage of LVDS signals from the MainBoard TNP4G431, as well as synchronizing signals from T-CON to loops with drivers.
Owners of the TX-R32LX80S TV are advised to contact only qualified specialists with the necessary experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to irreversible negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PANASONIC TX-R32LX80 Chassis LH80 for models TX-37LX80C, TX-32LX80C, TX-32LE8C-H, TX-32LE8C
MainBoard TNP4G431 is shown in the figure below:
TNP4G431
External view of the power supply
The main features of the PANASONIC TX-R32LX80S device:
Installed matrix (LCD panel) LTA320AA03 M01 LTA320AA03M01.
Matrix control uses Timing Controller (T-CON) 320AA03C2LV0.0.
An INV32S12M inverter is used to power the backlight lamps.
The formation of the necessary supply voltages for all nodes of the PANASONIC TX-R32LX80S TV is carried out by the TNP4G433 power module, or its analogs using FA5501AN, TUC4GJ5007 microcircuits and B1DFBR000008 power switches.
MainBoard - the main board (motherboard) is a TNP4G431 module, using EP1C6T144C7N, VCT6973G, TNP4G446, TNP4G448 and others.
The ENG39E04GF tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AA03
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Brightness: 500 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: CCFL
Signal Interface: LVDS (1 ch, 8-bit)
Voltage: 12.0V
TV PANASONIC TX-32LX80 with LCD display LTA320AA03M01, diagonal size 32 "(81 cm) 16: 9 format. Dynamic contrast ratio 8000: 1 is provided by a special control of the backlight depending on the illumination of areas in the scene.
The LTA320AA03M01 panel and TNP4G431 firmware can display HD images at 1366x768 pixels for 720p graphics resolution (HD Ready). The input analog video signal can be processed in PAL, SECAM, NTSC systems. Graphic processing and formation of a digital signal picture occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i.
Speaker power 20 W (2x10 W) is provided by two speakers. Uses NICAM stereo signal system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x3, audio x4, S-Video, component, VGA, HDMI x2. A headphone output is provided for individual listening. To connect a computer or laptop, a VGA (D-Sub 15) connector is used, which supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
Dimensions: with stand 820x578x225 mm, without stand 820x539x110 mm.
TV weight: 17 kg.
Attention! The LTA320AA03M01 panel of the PANASONIC TX-32LX80 LCD TV is a rather expensive component.
Avoid impacts on the glass and pressure on the screen surface to avoid irreversible damage to the LCD panel!